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A026381 as a simple table

na(n)
21
34
411
517
630
739
858
970
1095
11110
12141
13159
14196
15217
16260
17284
18333
19360
20415
21445
22506
23539
24606
25642
26715
27754
28833
29875
30960
311005
321096
331144
341241
351292
361395
371449
381558
391615
401730
411790
421911
431974
442101
452167
462300

[1,4,11,17,30,39,58,70,95,110,141,159,196,217,260,
 284,333,360,415,445,506,539,606,642,715,754,833,
 875,960,1005,1096,1144,1241,1292,1395,1449,1558,
 1615,1730,1790,1911,1974,2101,2167,2300]